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A physical hazard is defined as "A factor within the environment that can harm the body without necessarily touching it."

Vibration and noise are examples of physical hazards.

Physical hazards include but aren't limited to electricity, radiation, pressure, noise, heights and vibration amongst many others.

General education policy is set by multiple levels of the government like Federal, state and local governments. 

Superhero Batman shares a name with an oil production Batman, a town in Turkey.

The systematic name for a chemical is the unique name given to it by the International Union of Pure Applied Chemistry (IUPAC). The IUPAC name can differ from a chemical compound's general name.

PbO is an ionic compound since it consists of a Lead as metal and Oxygen as nonmetal. The systematic name for PbO is Lead (II) oxide. Here we need to put the (II) since lead has more than one combining capacity.

Protein synthesis at the ribosome is immediately preceeded by the transcription process.

The principles of joint operations are formed around the traditional principles of war.

Three additional principles :―

Restraint,

Perseverance, and

Legitimacy

are relevant to how the Armed Forces of the United States use combat power across the range of military operations.

Memory refresh is the process of periodically reading information from an area of computer memory and immediately rewriting the read information to the same area without modification, for the purpose of preserving the information.

Memory refresh is a background maintenance process required during the operation of semiconductor dynamic random-access memory (DRAM), the most widely used type of computer memory.